<?php

/**
 * show(2)  1 ... 62 63 64 65 66 67 68 ... 150
 * 分页样式
 * #page{font:12px/16px arial}
 * #page span{float:left;margin:0px 3px;}
 * #page a{float:left;margin:0 3px;border:1px solid #ddd;padding:3px 7px; text-decoration:none;color:#666}
 * #page a.now_page,#page a:hover{color:#fff;background:#05c}
 * @category     Shuxun Cms
 * @date         2015年11月19日
 * @author       Shuxun Team <kaiping.jiang@scshux.com>
 * @file         Pager.php
 */
namespace Scshux\Utils;

class Pager {
	public $first_row; // 起始行数
	public $list_rows; // 列表每页显示行数
	protected $total_pages; // 总页数
	protected $total_rows; // 总行数
	protected $now_page; // 当前页数
	protected $method = 'defalut'; // 处理情况 Ajax分页 Html分页(静态化时) 普通get方式
	protected $parameter = '';
	protected $page_name; // 分页参数的名称
	protected $ajax_func_name;
	public $plus = 3; // 分页偏移量
	protected $url;

	/**
	 * 构造函数
	 *
	 * @param unknown_type $data
	 */
	public function __construct($data = array()) {
		$this->total_rows = $data ['total_rows'];

		$this->parameter = ! empty ( $data ['parameter'] ) ? $data ['parameter'] : '';
		$this->list_rows = ! empty ( $data ['list_rows'] ) && $data ['list_rows'] <= 100 ? $data ['list_rows'] : 15;
		$this->total_pages = ceil ( $this->total_rows / $this->list_rows );
		$this->page_name = ! empty ( $data ['page_name'] ) ? $data ['page_name'] : 'p';
		$this->ajax_func_name = ! empty ( $data ['ajax_func_name'] ) ? $data ['ajax_func_name'] : '';

		$this->method = ! empty ( $data ['method'] ) ? $data ['method'] : '';

		/* 当前页面 */
		if (! empty ( $data ['now_page'] )) {
			$this->now_page = intval ( $data ['now_page'] );
		} else {
			$this->now_page = ! empty ( $_GET [$this->page_name] ) ? intval ( $_GET [$this->page_name] ) : 1;
		}
		$this->now_page = $this->now_page <= 0 ? 1 : $this->now_page;

		if (! empty ( $this->total_pages ) && $this->now_page > $this->total_pages) {
			$this->now_page = $this->total_pages;
		}
		$this->first_row = $this->list_rows * ($this->now_page - 1);
	}

	/**
	 * 得到当前连接
	 *
	 * @param
	 *        	$page
	 * @param
	 *        	$text
	 * @return string
	 */
	protected function _get_link($page, $text) {
		
		switch ($this->method) {
			case 'ajax' :
				$parameter = '';
				if ($this->parameter) {
					$parameter = ',' . $this->parameter;
				}
				return '<a onclick="' . $this->ajax_func_name . '(\'' . $page . '\'' . $parameter . ')" href="javascript:void(0)">' . $text . '</a>' . "\n";
				break;

			case 'html' :
				$url = str_replace ( '$$', $page, $this->parameter );
				return '<a href="' . $url . '">' . $text . '</a>' . "\n";
				break;

			default :
				return '<a href="' . $this->_get_url ( $page ) . '">' . $text . '</a>' . "\n";
				break;
		}
	}

	/**
	 * 设置当前页面链接
	 */
	protected function _set_url() {
		$url = $_SERVER ['REQUEST_URI'] . (strpos ( $_SERVER ['REQUEST_URI'], '?' ) ? '' : "?") . $this->parameter;
		$parse = parse_url ( $url );
		if (isset ( $parse ['query'] )) {
			parse_str ( $parse ['query'], $params );
			unset ( $params [$this->page_name] );
			$url = $parse ['path'] . '?' . http_build_query ( $params );
		}
		if (! empty ( $params )) {
			$url .= '&';
		}
		$this->url = $url;
	}

	/**
	 * 得到$page的url
	 *
	 * @param $page 页面
	 * @return string
	 */
	protected function _get_url($page) {
		if ($this->url === NULL) {
			$this->_set_url ();
		}
		// $lable = strpos('&', $this->url) === FALSE ? '' : '&';
		return $this->url . $this->page_name . '=' . $page;
	}

	/**
	 * 得到第一页
	 *
	 * @return string
	 *
	 */
	public function first_page($len=5,$name = '第一页') {
		if ($this->now_page > $len) {
			return $this->_get_link ( '1', $name );
		}
		return '';
	}

	/**
	 * 最后一页
	 *
	 * @param  $name
	 * @return string
	 */
	public function last_page($len=5,$name = '最后一页') {
		if ($this->now_page < $this->total_pages - $len) {
			return $this->_get_link ( $this->total_pages, $name );
		}
		return '';
	}

	/**
	 * 上一页
	 *
	 * @return string
	 *
	 */
	public function up_page($name = '上一页') {
		if ($this->now_page != 1) {
			return $this->_get_link ( $this->now_page - 1, $name );
		}
		return '';
	}

	/**
	 * 下一页
	 *
	 * @return string
	 */
	public function down_page($name = '下一页') {
		if ($this->now_page < $this->total_pages) {
			return $this->_get_link ( $this->now_page + 1, $name );
		}
		return '';
	}

	/**
	 * 分页样式输出
	 *
	 * @param
	 *        	$param
	 * @return string
	 */
	public function show($param = 1) {
		if ($this->total_rows < 1) {
			return '';
		}

		$className = 'show_' . $param;

		$classNames = get_class_methods ( $this );

		if (in_array ( $className, $classNames )) {
			return $this->$className ();
		}
		return '';
	}
	protected function show_2() {
		if ($this->total_pages != 1) {
			$return = '';
			$return .= $this->up_page ( '<' );
			for($i = 1; $i <= $this->total_pages; $i ++) {
				if ($i == $this->now_page) {
					$return .= "<a class='now_page'>$i</a>\n";
				} else {
					if ($this->now_page - $i >= 4 && $i != 1) {
						$return .= "<span class='pageMore'>...</span>\n";
						$i = $this->now_page - 3;
					} else {
						if ($i >= $this->now_page + 5 && $i != $this->total_pages) {
							$return .= "<span>...</span>\n";
							$i = $this->total_pages;
						}
						$return .= $this->_get_link ( $i, $i ) . "\n";
					}
				}
			}
			$return .= $this->down_page ( '>' );
			return $return;
		}
	}
	protected function show_1() {
		$plus = $this->plus;
		if ($plus + $this->now_page > $this->total_pages) {
			$begin = $this->total_pages - $plus * 2;
		} else {
			$begin = $this->now_page - $plus;
		}

		$begin = ($begin >= 1) ? $begin : 1;
		$return = '';
		$return .= $this->first_page ();
		$return .= $this->up_page ();
		for($i = $begin; $i <= $begin + $plus * 2; $i ++) {
			if ($i > $this->total_pages) {
				break;
			}
			if ($i == $this->now_page) {
				$return .= "<a class='now_page'>$i</a>\n";
			} else {
				$return .= $this->_get_link ( $i, $i ) . "\n";
			}
		}
		$return .= $this->down_page ();
		$return .= $this->last_page ();
		return $return;
	}
	protected function show_3() {
		$plus = $this->plus;
		if ($plus + $this->now_page > $this->total_pages) {
			$begin = $this->total_pages - $plus * 2;
		} else {
			$begin = $this->now_page - $plus;
		}
		$begin = ($begin >= 1) ? $begin : 1;
		$return = '总计 ' . $this->total_rows . ' 个记录分为 ' . $this->total_pages . ' 页, 当前第 ' . $this->now_page . ' 页 ';
		$return .= ',每页 ';
		$return .= '<input type="text" value="' . $this->list_rows . '" id="pageSize" size="3"> ';
		$return .= $this->first_page () . "\n";
		$return .= $this->up_page () . "\n";
		$return .= $this->down_page () . "\n";
		$return .= $this->last_page () . "\n";
		$return .= '<select onchange="' . $this->ajax_func_name . '(this.value)" id="gotoPage">';

		for($i = $begin; $i <= $begin + 10; $i ++) {
			if ($i > $this->total_pages) {
				break;
			}
			if ($i == $this->now_page) {
				$return .= '<option selected="true" value="' . $i . '">' . $i . '</option>';
			} else {
				$return .= '<option value="' . $i . '">' . $i . '</option>';
			}
		}
		$return .= '</select>';
		return $return;
	}
	/**
	 * pc mobile  同时返回
	 * @return \stdClass
	 */
	public function shows()
	{
		$pager = new \stdClass();
		$pager->pcpager = $this->show_1();
		$pager->mobilepager = $this->show_4();
	
		return $pager ;
	
	}
	
	/**
	 * 手机端分页显示 
	 */
	protected function show_4()
	{
		$plus = $this->plus;
		if ($plus + $this->now_page > $this->total_pages) {
			$begin = $this->total_pages - $plus * 2;
		} else {
			$begin = $this->now_page - $plus;
		}
		
		$begin = ($begin >= 1) ? $begin : 1;
		$return = '';
		$return .= $this->first_page (1,'首页');
		$return .= $this->up_page ();
		$return .= $this->down_page ();
		$return .= $this->last_page (1,'尾页');
		
		return $return;
	}
}